It is indeed true that there is less demand for classical music than there was in recent decades, that it is harder to balance our budgets and that numerous orchestras (and other arts institutions) are likely to disappear in the coming decades. This does not mean that every institution is doomed nor that classical music will not be available in the future.
While there certainly is an element of luck involved when searching for these heroic few, the organizations that have built a cadre of dedicated supporters almost always have a few who simply cannot imagine the organization going away and are willing to put their resources where their passion resides.
The Atlanta Symphony Orchestra has joined the growing list of arts institutions that have locked out (or threatened to lock out) its artists unless substantial wage concessions can be obtained. In each case, management believes that large deficits will only be erased if costs are reduced substantially.